Ok I'm using 19lb injectors and I want to convert to 24s. I'd seen a 73 mm C&L meter(with sensor) for sell and it included sampling tubes for both 19 and 24. The guy tells me my stock sensor would actually work fine for either type of injector, but the tube would need to be changed for the proper calibration. Does that sound right to you guys? Is changing the tubes a big job?